TDataSet.Open procedure

Declaration

procedure Open

Description

Open must be used to make the TDataset Active. It does nothing if the dataset is already active. Open initializes the TDataset and brings the dataset in a browsable state:

Effectively the following happens:

1. The BeforeOpen event is triggered.
2. The descendents InternalOpen method is called to actually fetch data and initialize fielddefs and field instances.
3. BOFis set to True
4. Internal buffers are allocated and filled with data
5. If the dataset is empty, EOF is set to true
6. State is set to dsBrowse
7. The AfterOpen event is triggered

Errors

If the descendent class cannot fetch the data, or the data does not match the field definitions present in the dataset, then an exception will be raised.

See also

• Active
• State
• BOF
• EOF
• BeforeOpen
• AfterOpen